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Re^2: Perl PDL slower than python numpy (Updated2)

by etj (Chaplain)
on Apr 19, 2022 at 22:55 UTC ( #11143111=note: print w/replies, xml ) Need Help??

in reply to Re: Perl PDL slower than python numpy (Updated2)
in thread Perl PDL slower than python numpy

2022 updates to this excellent note:
  • with 2.058, zeroes was optimised so that the ndarray is initialised using memset (see for discussion and measurements).
  • with 2.077, the PDL shells have a with_time { code... } function to make this sort of measurement easier.
Observation: the first command of the above snippet is slightly quicker than the rest; this may be because the following ones, in assigning to e.g. $y, will trigger the destruction of the previous contents of that variable, which is likely to take some time.

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